Abstract

In general, almost all programs have experienced difficulties of virus infections and/or other diseases in the cutting operations. A careful and systematic testing program must be developed with micro-propagation methods. More production ofin vitro plantlets and cuttings is usually needed in the early years of a program than is needed later. The re-use of non-certified seed derived from high quality certified seed eventually reduces the demand for certified seed. Over production of cuttings is not an uncommon occurrence as a seed program matures. High quality seed does not always result in higher yields of ware potatoes. An economic analysis of the system should be initiated early in the development of a program. Studies on seed marketing and demand are usually beneficial to the proper planning and executing of a seed production program. In vitro propagation and rapid multiplication of pathogen-tested cultivars are fast becoming an important factor in developing self-sufficiency in seed potato production in Third World countries. The reduced number of field generations needed to supply sufficient quantities of quality seed is becoming a reality in countries where climatic and economic constraints are limiting.

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